Grapevine named ‘IFG Thirty’

ABSTRACT

This invention is a new and distinct grapevine variety denominated ‘IFG Thirty’. The new grapevine ‘IFG Thirty’ is characterized by producing naturally large, ovate to elongated ovate, black seedless berries which are firm in texture, medium low in acidity and ripen late in the growing season.

Latin name of the genus and species claimed: Vitis interspecific hybrid.

Variety denomination: ‘IFG Thirty’.

BACKGROUND OF THE INVENTION

The new and distinct grapevine described and claimed herein originatedfrom a hand pollination of the 06095-096-043, an unnamed interspecificseedling selection from the IFG breeding program, and ‘IFG Sixteen’(U.S. Plant Pat. No. 25,434) hybridized in May 2009. The abortive seedtraces were subsequently embryo cultured and the resulting 47 plantswere planted in the field in April 2010. The present variety ofgrapevine was selected as a single plant in September 2012 and was firstasexually propagated by hardwood cuttings in December 2012 near Delano,Kern County, Calif. These resulting cuttings produced second generationplants that were planted during April 2013 at the International FruitGenetics LLC research facility near Delano, Kern County, Calif. and wereobserved for four years and found to be true-to-type.

BRIEF SUMMARY OF THE INVENTION

The new grapevine ‘IFG Thirty’ is characterized by producing naturallylarge, ovate to elongated ovate, black seedless berries which are firmin texture, medium low in acidity and ripen late in the growing season.Fruits normally ripen late August to mid-September near Delano, Calif.

To the inventor's knowledge, the new grapevine variety is most similarto the ‘Autumn Royal’ variety. ‘IFG Thirty’ can be distinguished fromthe Autumn Royal variety by having a broader, more desirable clustershape and thicker and tougher peduncle and pedicle, by having a muchsmaller residual seed trace, by having no tendency to develop anastringent flavor and by having higher, more consistent yields.

‘IFG Thirty’ can be distinguished from its female parent, the IFG06095-096-043, by having larger, more elongated berries which are morefully black in color and by having larger clusters. ‘IFG Thirty’ can bedistinguished from its pollen parent, the ‘IFG Sixteen’, by havingfirmer berries that more easily attain full black color under hotconditions and by ripening slightly earlier.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying photographic drawing in FIG. 1 illustrates in fullcolor ‘IFG Thirty’, taken from a 4-year-old vine. The photograph wastaken outdoors with indirect lighting. The colors are as nearly true asis reasonably possible in a color representation of this type. The topportion of the drawing has a mature leaf. A mature fruit cluster isrepresented in the center of the drawing along with a typical berry incross section. A young shoot tip with tendrils and young leaves can beseen on the bottom portion of the drawing.

DETAILED BOTANICAL DESCRIPTION OF THE INVENTION

Throughout this specification, color names beginning with a small lettersignify that the name of that color, as used in common speech, is aptlydescriptive. Color names beginning with a capital letter designatevalues based upon R.H.S. Colour Chart, published in 2001 by The RoyalHorticultural Society, London, England.

Throughout this specification subjective description values conform tothose set forth by the International Plant Genetic Resources Institutepublication ‘Descriptors for Grape’ (vitis spp.) (1983) which wasdeveloped in collaboration with the Office International de la Vigne etdu Vin (OIV) and the International Union for the Protection of NewVarieties of Plants (UPOV).

The descriptive matter which follows pertains to ‘IFG Thirty’ plantsgrown in the vicinity of Delano, Kern County, Calif. during 2015, and isbelieved to apply to plants of the variety grown under similarconditions of soil and climate elsewhere:

-   Vine:    -   -   General.—Vigor — Moderate. Density of foliage — Medium.            Productivity — Very productive, produces about 45 to 68 kg            of fruit per vine. Root stock — Own root. Training method —            Typically spur pruned leaving 2 bud spurs.        -   Trunk.—Trunk diameter of 4-year-old vines at 30 cm above the            soil line — About 4.5 cm. Shape — Medium to slightly stocky.            Straps — Long, continuous. Surface texture — Slightly            shaggy. Inner bark color — The following colors were            observed: Greyed-orange: 177A and 166A.-   Shoots:    -   -   Young shoot.—Form of tip — Wide open. Distribution of            anthocyanin coloration of tip — Absent. Density of prostrate            hairs of tip — Sparse. Density of erect hairs of tip —            Sparse. Color — Yellow-green: 144A.        -   Woody shoot (mature canes).—Shape — Medium to somewhat            stocky. Internode length — Medium: about 12.2 cm. Width at            node — About 1.3 cm. Cross section — Circular. Surface —            Striate. Main color — The following colors were observed:            Greyed-orange: 177A and 177B and 175A. Density of erect            hairs of nodes — None or very sparse. Density of erect hairs            on internodes — None or very sparse. Axillary shoot length            at full bloom — Weak to medium, approximately 5.7 cm.        -   Flowering shoot.—Vigor during flowering — Medium. Attitude            during flowering on shoots not tied — Semi-erect. Color —            dorsal side of internodes — Yellow-green: 146C, with            Red-purple stripes: 59B. Color — ventral side of internodes            — Yellow-green: 146C. Color — dorsal side of nodes —            Yellow-green: 146C. Color — ventral side of nodes —            Yellow-green: 146C. Density of prostrate hairs on nodes —            Sparse. Density of erect hairs on nodes — None. Density of            prostrate hairs on internode — Very sparse. Density of erect            hairs on internode — None. Anthocyanin coloration of buds —            Absent.        -   Tendrils.—Distribution on the shoot (at full flowering) —            Discontinuous. Length of tendril — Long: about 29.6 cm.            Thickness of tendril 2 cm from base — About 2.9 cm. Color —            Yellow-green: N144A. Form — Bifurcated and trifurcated.            Number of consecutive tendrils — 2.-   Leaves    -   -   Young leaves.—Color of upper surface of first four distal            unfolded leaves — Yellow-green: 144A. Average intensity of            anthocyanin coloration of six distal leaves prior to            flowering — Very weak. Density of prostrate hairs between            veins (lower surface) — Very sparse. Density of prostrate            hairs on veins (lower surface) — Sparse to medium. Density            of erect hairs between veins (lower surface) — Absent.            Density of erect hairs on veins (lower surface) — Sparse.        -   Mature leaves.—Average length — About 16.5 cm. Average width            — About 22.8 cm. Mature leaf size — Large. Shape of blade —            Wedge-shaped. Number of lobes — 5. Blade venation — Palmate.            Anthocyanin coloration of main veins on upper side of blade            — Very weak. Mature leaf profile — Flat. Blistering surface            of blade upper surface — Very weak. Leaf apex — Acute.            Undulation of margin — Slight. Thickness — Medium.            Undulation of blade between main and lateral veins — Slight            undulation over entire area. Shape of teeth — Both sides            concave. Length of teeth — Medium. Ratio length/width of            teeth — Medium. Shape of upper lateral sinuses — Open to            lobes slightly overlapping. Depth of upper lateral sinuses —            Medium. General shape petiole sinus — Wide open. Shape of            base of upper leaf sinuses — V-shaped. Tooth at petiole            sinus — Absent. Density of prostrate hairs between veins on            lower surface of blade — Very sparse. Density of erect hairs            between veins on lower surface of blade — Absent. Density of            prostrate hairs on main veins on lower surface of blade —            Very sparse. Density of erect hairs on main veins on lower            surface of blade — Sparse. Density of prostrate hairs on            main veins on upper surface of blade — Very sparse. Density            of erect hairs on main veins on upper surface of blade —            None. Autumn coloration of leaves — Leaves can be a single            color or combination of colors, in a mottled pattern or on            the edges of the leaves: The following colors were observed:            Greyed-yellow: 162A and 162B, Greyed-purple: N186B and187A            and 187B and 184A, Greyed-red: 181A and 181B and 181C.        -   Upper surface.—Color — The following colors were observed:            137A and 137B and 137C. Color of main veins — Yellow-green:            145A. Anthocyanin coloration of main veins (upper surface) —            Very weak: Red-purple: 59B. Surface appearance — Dull.            Blistering surface of blade — Very weak.        -   Lower surface.—Color — Yellow-green: 146B. Color of main            veins — Yellow-green: 145C. Anthocyanin coloration of main            veins (lower surface) — Absent. Glossiness — Weak. Surface            texture — Smooth. Surface appearance — Dull.        -   Petiole.—Length — About 13 cm. Diameter of petiole 2 cm from            blade — 3.3 mm. Petiole color — The following colors were            observed: Yellow-green: 145A and 145B and Red-purple: 59B.            Length of petiole compared to middle vein — Slightly            shorter. Density of prostrate hairs on petiole — Very            sparse. Density of erect hairs on petiole — None.        -   Buds.—Bud fruitfulness — Basal: Mostly fruitful. Position of            first fruitful shoot on previous season cane — 1^(st) to            2^(nd) node. Dormant bud length — About 5.2 mm. Dormant bud            width in the proximal/distal plane — About 5.8 mm. Dormant            bud color — Greyed-orange: 166A. Time of bud burst —            Midseason: about Mar. 5, 2015.-   Flowers:    -   -   General.—Flower sex — Hermaphrodite. Length of single            flower, unopened — About 3.5 mm. Width of single flower —            Unopened: About 1.8 mm. Opened: About 7.0 mm. Stamen count            — 5. Pollen color — Yellow: 10A. Pistil length — About            3.5 mm. Pistil color — Yellow-green: 144A. Length of first            inflorescence — Medium — long: About 18.7 cm long by 14.1 cm            wide. Position of first flowering and fruiting node — 3^(rd)            to 4^(th) node (current season growth). Number of            inflorescence per flowering shoot — 1.1 to 2. Time of bloom            — Medium as compared with similar varieties in the growing            area of Delano, Calif. Date of full bloom — About May 2,            2015.-   Fruit:    -   -   General.—Ripening period — Mid to late season: Approximately            Aug. 31, 2015. Use — Fresh market. Keeping quality — Good to            excellent: remains commercially acceptable when stored up to            8 weeks at 0° C. and high RH. Resistance to — Insects:            Average typical of Vitis vinifera species. Diseases: Average            typical of Vitis vinifera species. Refractometer test —            Soluble solids: about 17.8. Brix/acid — About 57.4%. %            Titratable acidity — About 0.31. Juice pH — About 3.59.            Juice color — Greyed-purple: 182B.        -   Cluster.—Mature cluster length (peduncle excluded) — About            26.1 cm. Mature cluster width — About 20.3 cm. Mature            cluster weight — About 1516 g. Bunch density — Medium.            Number of berries — About 242. Form — Conical.        -   Peduncle.—Lignification of peduncle — Weak. Length of            peduncle — Medium, approximately 4.3 cm. Color of peduncle —            Yellow-green: 145A.        -   Berry.—Uniformity of size — Uniform. Single berry weight —            About 7.3 g natural: to about 7.3 g when treated with            gibberellic acid. Shape — Ovate to elongated ovate. Seeds —            Absent. Cross section — Circular. Berry dimensions —            Longitudinal axis: about 37.0 mm: horizontal axis: about            20.2 mm. Pedicel length — About 9.1 mm. Pedicel width —            About 1.4 mm. Pedicel color — Yellow-green: 144C. Berry            firmness — Moderately firm. Berry juiciness — Moderately            juicy. Particular flavor — Neutral. Bloom (cuticular wax) —            Medium. Berry separation from pedicel — Moderate. Skin color            (without bloom) — The following colors were observed:            Greyed-purple: N186A and N186B. Flesh color — White: 155A.            Anthocyanin coloration of flesh — Absent.        -   Skin.—Thickness — Medium. Skin toughness — Not notable when            chewing. Reticulation — Absent. Tenacity — Tenacious to            flesh.

What is claimed:
 1. A new and distinct variety of grapevine as hereinillustrated and described.